Re-enable canvas optimization for getImageData with new codepath

Re-enable canvas optimization for getImageData with new codepath

This change re-enables the optimization that makes canvases switch
out of gpu-acceleration when getImageData is called.  The old
implementation was scrapped in favor of the new
ImageBuffer::disableAcceleration method that was introduced by
https://crrev.com/98739b054a5b28cc607d688b2e9e582456bbb20e

BUG=606688
Committed: https://crrev.com/e56410217e3d336d0c2d1dbc442180aefba935c5
Cr-Commit-Position: refs/heads/master@{#406950}

[Justin Novosad, 2016-07-20 19:31:25]

junov@chromium.org changed reviewers:
+ xidachen@chromium.org, xlai@chromium.org

[Justin Novosad, 2016-07-20 19:31:26]

PTAL

[xidachen, 2016-07-20 20:22:23]

lgtm

[Justin Novosad, 2016-07-20 20:45:39]

The CQ bit was checked by junov@chromium.org

[commit-bot: I haz the power, 2016-07-20 20:45:59]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-07-20 22:22:29]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2016-07-20 22:22:31]

Try jobs failed on following builders:
  linux_chromium_rel_ng on master.tryserver.chromium.linux (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/linux_chromium_...)

[Justin Novosad, 2016-07-21 18:14:54]

The CQ bit was checked by junov@chromium.org to run a CQ dry run

[Justin Novosad, 2016-07-21 18:15:03]

The CQ bit was unchecked by junov@chromium.org

[Justin Novosad, 2016-07-21 18:15:08]

The CQ bit was checked by junov@chromium.org

[Justin Novosad, 2016-07-21 18:15:08]

The patchset sent to the CQ was uploaded after l-g-t-m from
xidachen@chromium.org
Link to the patchset: https://codereview.chromium.org/2171513003/#ps20001
(title: "fix tests")

[commit-bot: I haz the power, 2016-07-21 18:15:55]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-07-21 21:24:52]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2016-07-21 21:27:59]

Description was changed from

==========
Re-enable canvas optimization for getImageData with new codepath

This change re-enables the optimization that makes canvases switch
out of gpu-acceleration when getImageData is called.  The old
implementation was scrapped in favor of the new
ImageBuffer::disableAcceleration method that was introduced by
https://crrev.com/98739b054a5b28cc607d688b2e9e582456bbb20e

BUG=606688
==========

to

==========
Re-enable canvas optimization for getImageData with new codepath

This change re-enables the optimization that makes canvases switch
out of gpu-acceleration when getImageData is called.  The old
implementation was scrapped in favor of the new
ImageBuffer::disableAcceleration method that was introduced by
https://crrev.com/98739b054a5b28cc607d688b2e9e582456bbb20e

BUG=606688

Committed: https://crrev.com/e56410217e3d336d0c2d1dbc442180aefba935c5
Cr-Commit-Position: refs/heads/master@{#406950}
==========

[commit-bot: I haz the power, 2016-07-21 21:28:00]

Patchset 2 (id:??) landed as
https://crrev.com/e56410217e3d336d0c2d1dbc442180aefba935c5
Cr-Commit-Position: refs/heads/master@{#406950}